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FFmpeg/libavcodec/mpc8.c

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  1. /*

  2.  * Musepack SV8 decoder

  3.  * Copyright (c) 2007 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file libavcodec/mpc8.c Musepack SV8 decoder

  24.  * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples

  25.  * divided into 32 subbands.

  26.  */

  27. 

  28. #include "libavutil/lfg.h"

  29. #include "avcodec.h"

  30. #include "get_bits.h"

  31. #include "dsputil.h"

  32. #include "mpegaudio.h"

  33. 

  34. #include "mpc.h"

  35. #include "mpcdata.h"

  36. #include "mpc8data.h"

  37. #include "mpc8huff.h"

  38. 

  39. static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];

  40. static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;

  41. 

  42. static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };

  43. static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };

  44. 

  45. static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)

  46. {

  47.     int code = get_bits(gb, mpc8_cnk_len[k-1][n-1] - 1);

  48. 

  49.     if (code >= mpc8_cnk_lost[k-1][n-1])

  50.         code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];

  51. 

  52.     return code;

  53. }

  54. 

  55. static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)

  56. {

  57.     int bits = 0;

  58.     const uint32_t * C = mpc8_cnk[k-1];

  59.     int code = mpc8_dec_base(gb, k, n);

  60. 

  61.     do {

  62.         n--;

  63.         if (code >= C[n]) {

  64.             bits |= 1 << n;

  65.             code -= C[n];

  66.             C -= 32;

  67.             k--;

  68.         }

  69.     } while(k > 0);

  70. 

  71.     return bits;

  72. }

  73. 

  74. static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)

  75. {

  76.     if(mpc8_cnk_len[0][m] < 1) return 0;

  77.     return mpc8_dec_base(gb, 1, m+1);

  78. }

  79. 

  80. static int mpc8_get_mask(GetBitContext *gb, int size, int t)

  81. {

  82.     int mask = 0;

  83. 

  84.     if(t && t != size)

  85.          mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);

  86.     if((t << 1) > size) mask = ~mask;

  87. 

  88.     return mask;

  89. }

  90. 

  91. static const uint16_t vlc_offsets[13] = {

  92.     0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708

  93. };

  94. 

  95. static av_cold int mpc8_decode_init(AVCodecContext * avctx)

  96. {

  97.     int i;

  98.     MPCContext *c = avctx->priv_data;

  99.     GetBitContext gb;

  100.     static int vlc_initialized = 0;

  101. 

  102.     static VLC_TYPE band_table[542][2];

  103.     static VLC_TYPE q1_table[520][2];

  104.     static VLC_TYPE q9up_table[524][2];

  105.     static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];

  106.     static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];

  107.     static VLC_TYPE dscf0_table[560][2];

  108.     static VLC_TYPE dscf1_table[598][2];

  109.     static VLC_TYPE q3_0_table[512][2];

  110.     static VLC_TYPE q3_1_table[516][2];

  111.     static VLC_TYPE codes_table[5708][2];

  112. 

  113.     if(avctx->extradata_size < 2){

  114.         av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);

  115.         return -1;

  116.     }

  117.     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));

  118.     av_lfg_init(&c->rnd, 0xDEADBEEF);

  119.     dsputil_init(&c->dsp, avctx);

  120. 

  121.     ff_mpc_init();

  122. 

  123.     init_get_bits(&gb, avctx->extradata, 16);

  124. 

  125.     skip_bits(&gb, 3);//sample rate

  126.     c->maxbands = get_bits(&gb, 5) + 1;

  127.     skip_bits(&gb, 4);//channels

  128.     c->MSS = get_bits1(&gb);

  129.     c->frames = 1 << (get_bits(&gb, 3) * 2);

  130. 

  131.     if(vlc_initialized) return 0;

  132.     av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");

  133. 

  134.     band_vlc.table = band_table;

  135.     band_vlc.table_allocated = 542;

  136.     init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,

  137.              mpc8_bands_bits,  1, 1,

  138.              mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  139. 

  140.     q1_vlc.table = q1_table;

  141.     q1_vlc.table_allocated = 520;

  142.     init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,

  143.              mpc8_q1_bits,  1, 1,

  144.              mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  145.     q9up_vlc.table = q9up_table;

  146.     q9up_vlc.table_allocated = 524;

  147.     init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,

  148.              mpc8_q9up_bits,  1, 1,

  149.              mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  150. 

  151.     scfi_vlc[0].table = scfi0_table;

  152.     scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;

  153.     init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,

  154.              mpc8_scfi0_bits,  1, 1,

  155.              mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  156.     scfi_vlc[1].table = scfi1_table;

  157.     scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;

  158.     init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,

  159.              mpc8_scfi1_bits,  1, 1,

  160.              mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  161. 

  162.     dscf_vlc[0].table = dscf0_table;

  163.     dscf_vlc[0].table_allocated = 560;

  164.     init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,

  165.              mpc8_dscf0_bits,  1, 1,

  166.              mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  167.     dscf_vlc[1].table = dscf1_table;

  168.     dscf_vlc[1].table_allocated = 598;

  169.     init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,

  170.              mpc8_dscf1_bits,  1, 1,

  171.              mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  172. 

  173.     q3_vlc[0].table = q3_0_table;

  174.     q3_vlc[0].table_allocated = 512;

  175.     init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,

  176.              mpc8_q3_bits,  1, 1,

  177.              mpc8_q3_codes, 1, 1,

  178.              mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  179.     q3_vlc[1].table = q3_1_table;

  180.     q3_vlc[1].table_allocated = 516;

  181.     init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,

  182.              mpc8_q4_bits,  1, 1,

  183.              mpc8_q4_codes, 1, 1,

  184.              mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);

  185. 

  186.     for(i = 0; i < 2; i++){

  187.         res_vlc[i].table = &codes_table[vlc_offsets[0+i]];

  188.         res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];

  189.         init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,

  190.                  &mpc8_res_bits[i],  1, 1,

  191.                  &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  192. 

  193.         q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];

  194.         q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];

  195.         init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,

  196.                  &mpc8_q2_bits[i],  1, 1,

  197.                  &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  198. 

  199.         quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];

  200.         quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];

  201.         init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,

  202.                  &mpc8_q5_bits[i],  1, 1,

  203.                  &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  204.         quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];

  205.         quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];

  206.         init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,

  207.                  &mpc8_q6_bits[i],  1, 1,

  208.                  &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  209.         quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];

  210.         quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];

  211.         init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,

  212.                  &mpc8_q7_bits[i],  1, 1,

  213.                  &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  214.         quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];

  215.         quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];

  216.         init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,

  217.                  &mpc8_q8_bits[i],  1, 1,

  218.                  &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  219.     }

  220.     vlc_initialized = 1;

  221.     avctx->sample_fmt = SAMPLE_FMT_S16;

  222.     avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;

  223.     return 0;

  224. }

  225. 

  226. static int mpc8_decode_frame(AVCodecContext * avctx,

  227.                             void *data, int *data_size,

  228.                             AVPacket *avpkt)

  229. {

  230.     const uint8_t *buf = avpkt->data;

  231.     int buf_size = avpkt->size;

  232.     MPCContext *c = avctx->priv_data;

  233.     GetBitContext gb2, *gb = &gb2;

  234.     int i, j, k, ch, cnt, res, t;

  235.     Band *bands = c->bands;

  236.     int off;

  237.     int maxband, keyframe;

  238.     int last[2];

  239. 

  240.     keyframe = c->cur_frame == 0;

  241. 

  242.     if(keyframe){

  243.         memset(c->Q, 0, sizeof(c->Q));

  244.         c->last_bits_used = 0;

  245.     }

  246.     init_get_bits(gb, buf, buf_size * 8);

  247.     skip_bits(gb, c->last_bits_used & 7);

  248. 

  249.     if(keyframe)

  250.         maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);

  251.     else{

  252.         maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);

  253.         if(maxband > 32) maxband -= 33;

  254.     }

  255.     c->last_max_band = maxband;

  256. 

  257.     /* read subband indexes */

  258.     if(maxband){

  259.         last[0] = last[1] = 0;

  260.         for(i = maxband - 1; i >= 0; i--){

  261.             for(ch = 0; ch < 2; ch++){

  262.                 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];

  263.                 if(last[ch] > 15) last[ch] -= 17;

  264.                 bands[i].res[ch] = last[ch];

  265.             }

  266.         }

  267.         if(c->MSS){

  268.             int mask;

  269. 

  270.             cnt = 0;

  271.             for(i = 0; i < maxband; i++)

  272.                 if(bands[i].res[0] || bands[i].res[1])

  273.                     cnt++;

  274.             t = mpc8_get_mod_golomb(gb, cnt);

  275.             mask = mpc8_get_mask(gb, cnt, t);

  276.             for(i = maxband - 1; i >= 0; i--)

  277.                 if(bands[i].res[0] || bands[i].res[1]){

  278.                     bands[i].msf = mask & 1;

  279.                     mask >>= 1;

  280.                 }

  281.         }

  282.     }

  283.     for(i = maxband; i < c->maxbands; i++)

  284.         bands[i].res[0] = bands[i].res[1] = 0;

  285. 

  286.     if(keyframe){

  287.         for(i = 0; i < 32; i++)

  288.             c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;

  289.     }

  290. 

  291.     for(i = 0; i < maxband; i++){

  292.         if(bands[i].res[0] || bands[i].res[1]){

  293.             cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;

  294.             if(cnt >= 0){

  295.                 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);

  296.                 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);

  297.                 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;

  298.             }

  299.         }

  300.     }

  301. 

  302.     for(i = 0; i < maxband; i++){

  303.         for(ch = 0; ch < 2; ch++){

  304.             if(!bands[i].res[ch]) continue;

  305. 

  306.             if(c->oldDSCF[ch][i]){

  307.                 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;

  308.                 c->oldDSCF[ch][i] = 0;

  309.             }else{

  310.                 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);

  311.                 if(t == 64)

  312.                     t += get_bits(gb, 6);

  313.                 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;

  314.             }

  315.             for(j = 0; j < 2; j++){

  316.                 if((bands[i].scfi[ch] << j) & 2)

  317.                     bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];

  318.                 else{

  319.                     t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);

  320.                     if(t == 31)

  321.                         t = 64 + get_bits(gb, 6);

  322.                     bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;

  323.                 }

  324.             }

  325.         }

  326.     }

  327. 

  328.     for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){

  329.         for(ch = 0; ch < 2; ch++){

  330.             res = bands[i].res[ch];

  331.             switch(res){

  332.             case -1:

  333.                 for(j = 0; j < SAMPLES_PER_BAND; j++)

  334.                     c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;

  335.                 break;

  336.             case 0:

  337.                 break;

  338.             case 1:

  339.                 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){

  340.                     cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);

  341.                     t = mpc8_get_mask(gb, 18, cnt);

  342.                     for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)

  343.                         c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;

  344.                 }

  345.                 break;

  346.             case 2:

  347.                 cnt = 6;//2*mpc8_thres[res]

  348.                 for(j = 0; j < SAMPLES_PER_BAND; j += 3){

  349.                     t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);

  350.                     c->Q[ch][off + j + 0] = mpc8_idx50[t];

  351.                     c->Q[ch][off + j + 1] = mpc8_idx51[t];

  352.                     c->Q[ch][off + j + 2] = mpc8_idx52[t];

  353.                     cnt = (cnt >> 1) + mpc8_huffq2[t];

  354.                 }

  355.                 break;

  356.             case 3:

  357.             case 4:

  358.                 for(j = 0; j < SAMPLES_PER_BAND; j += 2){

  359.                     t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];

  360.                     c->Q[ch][off + j + 1] = t >> 4;

  361.                     c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);

  362.                 }

  363.                 break;

  364.             case 5:

  365.             case 6:

  366.             case 7:

  367.             case 8:

  368.                 cnt = 2 * mpc8_thres[res];

  369.                 for(j = 0; j < SAMPLES_PER_BAND; j++){

  370.                     t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];

  371.                     c->Q[ch][off + j] = t;

  372.                     cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);

  373.                 }

  374.                 break;

  375.             default:

  376.                 for(j = 0; j < SAMPLES_PER_BAND; j++){

  377.                     c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);

  378.                     if(res != 9){

  379.                         c->Q[ch][off + j] <<= res - 9;

  380.                         c->Q[ch][off + j] |= get_bits(gb, res - 9);

  381.                     }

  382.                     c->Q[ch][off + j] -= (1 << (res - 2)) - 1;

  383.                 }

  384.             }

  385.         }

  386.     }

  387. 

  388.     ff_mpc_dequantize_and_synth(c, maxband, data);

  389. 

  390.     c->cur_frame++;

  391. 

  392.     c->last_bits_used = get_bits_count(gb);

  393.     if(c->cur_frame >= c->frames)

  394.         c->cur_frame = 0;

  395.     *data_size =  MPC_FRAME_SIZE * 4;

  396. 

  397.     return c->cur_frame ? c->last_bits_used >> 3 : buf_size;

  398. }

  399. 

  400. AVCodec mpc8_decoder = {

  401.     "mpc8",

  402.     CODEC_TYPE_AUDIO,

  403.     CODEC_ID_MUSEPACK8,

  404.     sizeof(MPCContext),

  405.     mpc8_decode_init,

  406.     NULL,

  407.     NULL,

  408.     mpc8_decode_frame,

  409.     .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),

  410. };